package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.conditions.query.QueryChainWrapper;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.Follow;
import com.hmdp.mapper.FollowMapper;
import com.hmdp.service.IFollowService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.service.IUserService;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.jws.soap.SOAPBinding;
import javax.xml.ws.Holder;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private IUserService userService;
    @Override
    public Result follow(Long followUserId, Boolean isFollow) {
        //1.获取登录用户
        Long userId= UserHolder.getUser().getId();
        String key="follows:"+userId;
        //判断是关注还是取关
        if(isFollow){
            //2.关注，新增数据
            Follow follow=new Follow();
            follow.setUserId(userId);
            follow.setFollowUserId(followUserId);
            Boolean isSuccess=save(follow);
            if(isSuccess){
                //把关注用户的id存入redis
                stringRedisTemplate.opsForSet().add(key,followUserId.toString());
            }
        }else {
            //3.取关，删除 delete from tb_follow where user_id =? and follow_user_id=?
            Boolean isSuccess=remove(new QueryWrapper<Follow>()
            .eq("user_id",userId).eq("follow_user_id",followUserId));
            if(isSuccess){
                stringRedisTemplate.opsForSet().remove(key,followUserId.toString());
            }
        }
        return Result.ok();
    }

    @Override
    public Result isFollow(Long followUserId) {
        //1.获取登录用户
        Long userId=UserHolder.getUser().getId();
        //2.查询是否关注 select * from tb_follow where user_id=? and follow_user_id=?
        Integer count=query().eq("user_id",userId).eq("follow_user_id",followUserId).count();
        //3.判断
        return Result.ok(count>0);
    }


    @Override
    public Result followCommons(Long id) {
        //1.获取当前用户
        Long userId=UserHolder.getUser().getId();
        String key="follows:"+userId;
        //2.求交集
        String key2="follows:"+id;
        Set<String> intersect=stringRedisTemplate.opsForSet().intersect(key,key2);
        if(intersect==null||intersect.isEmpty()){
            //无交集
            return Result.ok(Collections.emptyList());
        }
        //3.解析id集合
        List<Long> ids=intersect.stream().map(Long::valueOf).collect(Collectors.toList());
        //4.查询用户
        List<UserDTO> users=userService.listByIds(ids)
                .stream()
                .map(user-> BeanUtil.copyProperties(user,UserDTO.class))
                .collect(Collectors.toList());
        return Result.ok(users);
    }
}
